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MTLO, LOST, SQ, QJ, QM, WC, MX, HJ > Normal Chilled Water (WC) > Flashcards

Normal Chilled Water (WC) Flashcards

0
Q

What supplementary loads does WC cool?

A

Non nuclear process sampling coolers
Polishing demins
Blowdown demins
Main generator collector housing

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1
Q

What buildings are cooled by the WC system during all modes of normal operation?

A

Containment, control, aux, and radwaste buildings

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2
Q

What is the maximum number of chiller allowed to be running at a given time?

A

2 of 3 large and the one small

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3
Q

What are the three most critical loads cooled by the WC system?

A

Ctmt norm AHUs
CEDM Control Cabinet room
Generator collector housing cooler

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4
Q

What interlock do the containment normal ACUs have?

A

When the fan is not running the isolation valve for the chilled water closes.

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5
Q

What provides cooling water for chillers A, B, C, and e02?

A

NC

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6
Q

What is the power supply to the A chiller compressor?

A

PB

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7
Q

What system provides makeup water for the chilled water expansion tank?

A

DW

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8
Q

What provides a 75 psig overpressure for the chilled water expansion tank?

A

GA nitrogen, or hydrogen if needed

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9
Q

What system provides power to the WC circulation pumps?

A

NH

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10
Q

What is the power supply to the B, C, and e02 chiller compressors?

A

NB

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11
Q

Where does the waste drains/vents go once collected by the CM system?

A

Chem waste neut tank

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12
Q

Describe the start up sequence when the chiller switch is taken to START.

A

The CW circ pump starts along with the oil pump

The compressor starts after a delay to allow oil pressure to rise and circulation to start.

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13
Q

Describe the sequence of events when the chiller switch is taken to STOP.

A

The CW circ pumps stops immediately with the compressor.

The oil pump continues to run on a time delayed stop to allow the compressor to coast down

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14
Q

How is the N2 cover gas in the chilled water expansion tank added?

A

Automatically to maintain 75 psig for NPSH.

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15
Q

How are chemical added to the system once introduced to the pot feeder?

A

The dP from the running WC pumps draws the chemicals in. Only one chemical may be added at a time.

16
Q

What three components add to the efficiency of the normal chillers?

A

Integral thermal economizer
Flash economizer
Two stage compressor

17
Q

What does the integral flash economizer do?

A

Sub cools the refrigerant

18
Q

What does the flash economizer do?

A

Increases the proportion of liquid refrigerant in the cooler which will lead to an increase in heat transfer.

19
Q

What is the purpose of the purpose of having a two stage compressor?

A

Decreases the required work of compressor, which increases efficiency.

20
Q

What causes surging and what do we use to prevent it?

A

Pressure of refrigerant in the condenser is higher than at the compressor discharge.
Use the hot gas bypass

21
Q

Describe stacking and what we use to prevent it.

A

Occurs during low loads
Hot gasses condense at too high of a rate and refrigerant “stacks” up in the condenser.
Refrigerant head pressure control valve

22
Q

How long must we wait to restart a chiller if started recently?

A

20 minutes

23
Q

How long must we wait to restart the chiller if it has tripped recently.

A

15 minutes.

24
Q

What ESFAS signal causes the motor operated isolation valves outside containment to close automatically.

A

CIAS

25
Q

How is cooling modulated for each individual ACU/AHU?

A

Chilled water flow is modulated by a three way temperature control valve.
Flow is directed to the heat load or a bypass line.

26
Q

How is makeup water to the WC system added?

A

Automatically to the expansion tank as sensed by LV-16

27
Q

What happens to the isolation valves to the radwaste/control building (UV-70), aux building (UV-71) headers on loss of IA?

A

They all fail closed

28
Q

What happens to the temperature control valves on a loss of IA?

A

The fail open to full cooling.

29
Q

What happens to the running chillers on a loss of NC?

A

The running normal chillers will trip and EW will take over to cool the “priority loads”

30
Q

What ESFAS signal will trip the A chiller package if it is running following a LOOP?

A

SIAS

31
Q

What happens to the WC flow upon receipt of a CIAS?

A

The WC flow to the ctmt normal ACUs is isolated.

MTLO, LOST, SQ, QJ, QM, WC, MX, HJ (6 decks)

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